terasic_de4led_fdt.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * This software was developed by SRI International and the University of
8 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
9 * ("CTSRD"), as part of the DARPA CRASH research programme.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD: stable/11/sys/dev/terasic/de4led/terasic_de4led_fdt.c 330897 2018-03-14 03:19:51Z eadler $");
35
36#include <sys/param.h>
37#include <sys/bus.h>
38#include <sys/condvar.h>
39#include <sys/conf.h>
40#include <sys/bio.h>
41#include <sys/kernel.h>
42#include <sys/lock.h>
43#include <sys/malloc.h>
44#include <sys/module.h>
45#include <sys/mutex.h>
46#include <sys/rman.h>
47#include <sys/systm.h>
48
49#include <machine/bus.h>
50#include <machine/resource.h>
51
52#include <dev/fdt/fdt_common.h>
53#include <dev/ofw/openfirm.h>
54#include <dev/ofw/ofw_bus.h>
55#include <dev/ofw/ofw_bus_subr.h>
56
57#include <dev/terasic/de4led/terasic_de4led.h>
58
59/*
60 * Nexus bus attachment for the 8-element LED on the Terasic DE-4 FPGA board,
61 * which is hooked up to the processor via a memory-mapped Avalon bus.
62 */
63static int
64terasic_de4led_fdt_probe(device_t dev)
65{
66
67	if (!ofw_bus_status_okay(dev))
68		return (ENXIO);
69
70	if (ofw_bus_is_compatible(dev, "sri-cambridge,de4led")) {
71		device_set_desc(dev, "Terasic DE4 8-element LED");
72		return (BUS_PROBE_DEFAULT);
73	}
74	return (ENXIO);
75}
76
77static int
78terasic_de4led_fdt_attach(device_t dev)
79{
80	struct terasic_de4led_softc *sc;
81
82	sc = device_get_softc(dev);
83	sc->tdl_dev = dev;
84	sc->tdl_unit = device_get_unit(dev);
85	sc->tdl_rid = 0;
86	sc->tdl_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
87	    &sc->tdl_rid, RF_ACTIVE);
88	if (sc->tdl_res == NULL) {
89		device_printf(dev, "couldn't map memory\n");
90		return (ENXIO);
91	}
92	terasic_de4led_attach(sc);
93	return (0);
94}
95
96static int
97terasic_de4led_fdt_detach(device_t dev)
98{
99	struct terasic_de4led_softc *sc;
100
101	sc = device_get_softc(dev);
102	KASSERT(sc->tdl_res != NULL, ("%s: resources not allocated",
103	    __func__));
104	terasic_de4led_detach(sc);
105	bus_release_resource(dev, SYS_RES_MEMORY, sc->tdl_rid, sc->tdl_res);
106	return (0);
107}
108
109static device_method_t terasic_de4led_fdt_methods[] = {
110	DEVMETHOD(device_probe,		terasic_de4led_fdt_probe),
111	DEVMETHOD(device_attach,	terasic_de4led_fdt_attach),
112	DEVMETHOD(device_detach,	terasic_de4led_fdt_detach),
113	{ 0, 0 }
114};
115
116static driver_t terasic_de4led_fdt_driver = {
117	"terasic_de4led",
118	terasic_de4led_fdt_methods,
119	sizeof(struct terasic_de4led_softc),
120};
121
122DRIVER_MODULE(terasic_de4led, simplebus, terasic_de4led_fdt_driver,
123    terasic_de4led_devclass, 0, 0);
124